package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        Long userId = BaseContext.getCurrentId();  // 拦截器拦截，解析出userId，threadLocal获取
        shoppingCart.setUserId(userId);
        //System.out.println(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果存在，只需要将数量+1
        if (list != null && !list.isEmpty()) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在，需要插入一条购物车数据
            //判断添加到购物的，是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //添加到购物车的是菜品,查菜品表，菜品的名称，图面等等
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            } else {
                //是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insert(shoppingCart);
        }
    }


    /**
     * 删除购物车的一个
     *
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 此时购物车的某个商品的数量必须 >= 1
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);


        // 执行数量减一操作
        if (list != null && list.size()>0) {
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if (number == 1) {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }


    /**
     * 查看购物车
     *
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        //获取当前微信用户的id
        Long userId = BaseContext.getCurrentId();

        //构建shoppingCart对象
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        //获取当前微信用户的id
        Long userId = BaseContext.getCurrentId();

        shoppingCartMapper.deleteByUserId(userId);

    }


}
